From f4ba7dd12b684b144457c6fc6ccc9f4fe71bde3c Mon Sep 17 00:00:00 2001
From: Martin Aeschlimann <martinae@microsoft.com>
Date: Tue, 11 Jan 2022 16:34:28 +0100
Subject: [PATCH 1/3] server bin cleanup

---
 build/gulpfile.reh.js                         | 19 +++++++++------
 .../vscode-test-resolver/src/extension.ts     |  7 +++---
 product.json                                  |  1 +
 .../bin-dev/{server.bat => code-server.bat}   |  0
 .../bin-dev/{server.sh => code-server.sh}     |  0
 .../server/bin-dev/{ => remote-cli}/code.cmd  |  2 +-
 .../server/bin-dev/{ => remote-cli}/code.sh   |  4 ++--
 resources/server/bin/code-server.cmd          | 24 +++++++++++++++++++
 .../server/bin/{server.sh => code-server.sh}  |  2 +-
 resources/server/bin/code.cmd                 |  4 ----
 resources/server/bin/helpers/browser.cmd      |  3 ++-
 resources/server/bin/remote-cli/code.cmd      |  5 ++++
 resources/server/bin/{ => remote-cli}/code.sh |  2 +-
 .../server/bin/{server.cmd => server-old.cmd} |  2 +-
 resources/server/bin/server-old.sh            | 12 ++++++++++
 src/vs/server/extensionHostConnection.ts      |  7 +++---
 .../server/remoteExtensionHostAgentServer.ts  |  7 ++++--
 src/vs/server/serverEnvironmentService.ts     |  3 +++
 18 files changed, 78 insertions(+), 26 deletions(-)
 rename resources/server/bin-dev/{server.bat => code-server.bat} (100%)
 rename resources/server/bin-dev/{server.sh => code-server.sh} (100%)
 rename resources/server/bin-dev/{ => remote-cli}/code.cmd (87%)
 rename resources/server/bin-dev/{ => remote-cli}/code.sh (72%)
 create mode 100644 resources/server/bin/code-server.cmd
 rename resources/server/bin/{server.sh => code-server.sh} (85%)
 delete mode 100644 resources/server/bin/code.cmd
 create mode 100644 resources/server/bin/remote-cli/code.cmd
 rename resources/server/bin/{ => remote-cli}/code.sh (86%)
 rename resources/server/bin/{server.cmd => server-old.cmd} (90%)
 create mode 100644 resources/server/bin/server-old.sh

diff --git a/build/gulpfile.reh.js b/build/gulpfile.reh.js
index 94f5ca1234d..2c474af58b6 100644
--- a/build/gulpfile.reh.js
+++ b/build/gulpfile.reh.js
@@ -300,26 +300,28 @@ function packageTask(type, platform, arch, sourceFolderName, destinationFolderNa
 
 		if (platform === 'win32') {
 			result = es.merge(result,
-				gulp.src('resources/server/bin/code.cmd', { base: '.' })
+				gulp.src('resources/server/bin/remote-cli/code.cmd', { base: '.' })
 					.pipe(replace('@@VERSION@@', version))
 					.pipe(replace('@@COMMIT@@', commit))
 					.pipe(replace('@@APPNAME@@', product.applicationName))
-					.pipe(rename(`bin/${product.applicationName}.cmd`)),
+					.pipe(rename(`bin/remote-cli/${product.applicationName}.cmd`)),
 				gulp.src('resources/server/bin/helpers/browser.cmd', { base: '.' })
 					.pipe(replace('@@VERSION@@', version))
 					.pipe(replace('@@COMMIT@@', commit))
 					.pipe(replace('@@APPNAME@@', product.applicationName))
 					.pipe(rename(`bin/helpers/browser.cmd`)),
-				gulp.src('resources/server/bin/server.cmd', { base: '.' })
-					.pipe(rename(`server.cmd`))
+				gulp.src('resources/server/bin/server-old.cmd', { base: '.' })
+					.pipe(rename(`server.cmd`)),
+				gulp.src('resources/server/bin/code-server.cmd', { base: '.' })
+					.pipe(rename(`bin/${product.serverApplicationName}.cmd`)),
 			);
 		} else if (platform === 'linux' || platform === 'alpine' || platform === 'darwin') {
 			result = es.merge(result,
-				gulp.src('resources/server/bin/code.sh', { base: '.' })
+				gulp.src('resources/server/bin/remote-cli/code.sh', { base: '.' })
 					.pipe(replace('@@VERSION@@', version))
 					.pipe(replace('@@COMMIT@@', commit))
 					.pipe(replace('@@APPNAME@@', product.applicationName))
-					.pipe(rename(`bin/${product.applicationName}`))
+					.pipe(rename(`bin/remote-cli/${product.applicationName}`))
 					.pipe(util.setExecutableBit()),
 				gulp.src('resources/server/bin/helpers/browser.sh', { base: '.' })
 					.pipe(replace('@@VERSION@@', version))
@@ -327,8 +329,11 @@ function packageTask(type, platform, arch, sourceFolderName, destinationFolderNa
 					.pipe(replace('@@APPNAME@@', product.applicationName))
 					.pipe(rename(`bin/helpers/browser.sh`))
 					.pipe(util.setExecutableBit()),
-				gulp.src('resources/server/bin/server.sh', { base: '.' })
+				gulp.src('resources/server/bin/server-old.sh', { base: '.' })
 					.pipe(rename(`server.sh`))
+					.pipe(util.setExecutableBit()),
+				gulp.src('resources/server/bin/code-server.sh', { base: '.' })
+					.pipe(rename(`bin/${product.serverApplicationName}`))
 					.pipe(util.setExecutableBit())
 			);
 		}
diff --git a/extensions/vscode-test-resolver/src/extension.ts b/extensions/vscode-test-resolver/src/extension.ts
index 3084cb6a098..6f916d80ea7 100644
--- a/extensions/vscode-test-resolver/src/extension.ts
+++ b/extensions/vscode-test-resolver/src/extension.ts
@@ -82,7 +82,7 @@ export function activate(context: vscode.ExtensionContext) {
 				return;
 			}
 
-			const { updateUrl, commit, quality, serverDataFolderName, dataFolderName } = getProductConfiguration();
+			const { updateUrl, commit, quality, serverDataFolderName, serverApplicationName, dataFolderName } = getProductConfiguration();
 			const commandArgs = ['--host=127.0.0.1', '--port=0', '--disable-telemetry', '--use-host-proxy', '--accept-server-license-terms'];
 			const env = getNewEnv();
 			const remoteDataDir = process.env['TESTRESOLVER_DATA_FOLDER'] || path.join(os.homedir(), serverDataFolderName || `${dataFolderName}-testresolver`);
@@ -102,7 +102,7 @@ export function activate(context: vscode.ExtensionContext) {
 			commandArgs.push('--connection-token-file', connectionTokenFile);
 
 			if (!commit) { // dev mode
-				const serverCommand = process.platform === 'win32' ? 'server.bat' : 'server.sh';
+				const serverCommand = process.platform === 'win32' ? 'code-server.bat' : 'code-server.sh';
 				const vscodePath = path.resolve(path.join(context.extensionPath, '..', '..'));
 				const serverCommandPath = path.join(vscodePath, 'resources', 'server', 'bin-dev', serverCommand);
 
@@ -115,7 +115,7 @@ export function activate(context: vscode.ExtensionContext) {
 					commandArgs.push('--install-builtin-extension', extensionToInstall);
 					commandArgs.push('--start-server');
 				}
-				const serverCommand = process.platform === 'win32' ? 'server.cmd' : 'server.sh';
+				const serverCommand = `${serverApplicationName}${process.platform === 'win32' ? '.cmd' : ''}`;
 				let serverLocation = env['VSCODE_REMOTE_SERVER_PATH']; // support environment variable to specify location of server on disk
 				if (!serverLocation) {
 					const serverBin = path.join(remoteDataDir, 'bin');
@@ -390,6 +390,7 @@ export interface IProductConfiguration {
 	commit: string;
 	quality: string;
 	dataFolderName: string;
+	serverApplicationName?: string;
 	serverDataFolderName?: string;
 }
 
diff --git a/product.json b/product.json
index a8573b1e50f..8432c4ba44c 100644
--- a/product.json
+++ b/product.json
@@ -9,6 +9,7 @@
 	"serverGreeting": [],
 	"serverLicense": [],
 	"serverLicensePrompt": "",
+	"serverApplicationName": "code-server-oss",
 	"win32DirName": "Microsoft Code OSS",
 	"win32NameVersion": "Microsoft Code OSS",
 	"win32RegValueName": "CodeOSS",
diff --git a/resources/server/bin-dev/server.bat b/resources/server/bin-dev/code-server.bat
similarity index 100%
rename from resources/server/bin-dev/server.bat
rename to resources/server/bin-dev/code-server.bat
diff --git a/resources/server/bin-dev/server.sh b/resources/server/bin-dev/code-server.sh
similarity index 100%
rename from resources/server/bin-dev/server.sh
rename to resources/server/bin-dev/code-server.sh
diff --git a/resources/server/bin-dev/code.cmd b/resources/server/bin-dev/remote-cli/code.cmd
similarity index 87%
rename from resources/server/bin-dev/code.cmd
rename to resources/server/bin-dev/remote-cli/code.cmd
index ac906785045..044a63a14a5 100644
--- a/resources/server/bin-dev/code.cmd
+++ b/resources/server/bin-dev/remote-cli/code.cmd
@@ -1,6 +1,6 @@
 @echo off
 setlocal
-SET VSCODE_PATH=%~dp0..\..\..
+SET VSCODE_PATH=%~dp0..\..\..\..
 FOR /F "tokens=* USEBACKQ" %%g IN (`where /r "%VSCODE_PATH%\.build\node" node.exe`) do (SET "NODE=%%g")
 call "%NODE%" "%VSCODE_PATH%\out\vs\server\cli.js" "Code Server - Dev" "" "" "code.cmd" %*
 endlocal
diff --git a/resources/server/bin-dev/code.sh b/resources/server/bin-dev/remote-cli/code.sh
similarity index 72%
rename from resources/server/bin-dev/code.sh
rename to resources/server/bin-dev/remote-cli/code.sh
index 61e57cb7abe..18165bfe3ce 100755
--- a/resources/server/bin-dev/code.sh
+++ b/resources/server/bin-dev/remote-cli/code.sh
@@ -5,9 +5,9 @@
 
 if [[ "$OSTYPE" == "darwin"* ]]; then
 	realpath() { [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"; }
-	VSCODE_PATH=$(dirname $(dirname $(dirname $(dirname $(realpath "$0")))))
+	VSCODE_PATH=$(dirname $(dirname $(dirname $(dirname $(dirname $(realpath "$0"))))))
 else
-	VSCODE_PATH=$(dirname $(dirname $(dirname $(dirname $(readlink -f $0)))))
+	VSCODE_PATH=$(dirname $(dirname $(dirname $(dirname $(dirname $(readlink -f $0))))))
 fi
 
 PROD_NAME="Code Server - Dev"
diff --git a/resources/server/bin/code-server.cmd b/resources/server/bin/code-server.cmd
new file mode 100644
index 00000000000..57e163af8ce
--- /dev/null
+++ b/resources/server/bin/code-server.cmd
@@ -0,0 +1,24 @@
+@echo off
+setlocal
+
+set ROOT_DIR=%~dp0..
+
+set _FIRST_ARG=%1
+if "%_FIRST_ARG:~0,9%"=="--inspect" (
+	set INSPECT=%1
+	shift
+) else (
+	set INSPECT=
+)
+
+:loop1
+if "%~1"=="" goto after_loop
+set RESTVAR=%RESTVAR% %1
+shift
+goto loop1
+
+:after_loop
+
+"%ROOT_DIR%\node.exe" %INSPECT% "%ROOT_DIR%\out\vs\server\main.js" %RESTVAR%
+
+endlocal
diff --git a/resources/server/bin/server.sh b/resources/server/bin/code-server.sh
similarity index 85%
rename from resources/server/bin/server.sh
rename to resources/server/bin/code-server.sh
index 66b7ec6381d..982180598ee 100644
--- a/resources/server/bin/server.sh
+++ b/resources/server/bin/code-server.sh
@@ -7,6 +7,6 @@ case "$1" in
 	--inspect*) INSPECT="$1"; shift;;
 esac
 
-ROOT="$(dirname "$0")"
+ROOT=$(dirname "$(dirname "$0")")
 
 "$ROOT/node" ${INSPECT:-} "$ROOT/out/vs/server/main.js" "$@"
diff --git a/resources/server/bin/code.cmd b/resources/server/bin/code.cmd
deleted file mode 100644
index 0cbff2f7c25..00000000000
--- a/resources/server/bin/code.cmd
+++ /dev/null
@@ -1,4 +0,0 @@
-@echo off
-setlocal
-call "%~dp0..\node" "%~dp0..\out\vs\server\cli.js" "@@APPNAME@@" "@@VERSION@@" "@@COMMIT@@" "@@APPNAME@@.cmd" %*
-endlocal
\ No newline at end of file
diff --git a/resources/server/bin/helpers/browser.cmd b/resources/server/bin/helpers/browser.cmd
index 33625f17d45..5bf6d0fcb68 100644
--- a/resources/server/bin/helpers/browser.cmd
+++ b/resources/server/bin/helpers/browser.cmd
@@ -1,4 +1,5 @@
 @echo off
 setlocal
-call "%~dp0..\..\node" "%~dp0..\..\out\vs\server\cli.js" "@@APPNAME@@" "@@VERSION@@" "@@COMMIT@@" "@@APPNAME@@.cmd" "--openExternal" %*
+set ROOT_DIR=%~dp0..\..
+call "%ROOT_DIR%\node.exe" "%ROOT_DIR%\out\vs\server\cli.js" "@@APPNAME@@" "@@VERSION@@" "@@COMMIT@@" "@@APPNAME@@.cmd" "--openExternal" %*
 endlocal
diff --git a/resources/server/bin/remote-cli/code.cmd b/resources/server/bin/remote-cli/code.cmd
new file mode 100644
index 00000000000..a33c6d3cf5c
--- /dev/null
+++ b/resources/server/bin/remote-cli/code.cmd
@@ -0,0 +1,5 @@
+@echo off
+setlocal
+set ROOT_DIR=%~dp0..\..
+call "%ROOT_DIR%\node.exe" "%ROOT_DIR%\out\vs\server\cli.js" "@@APPNAME@@" "@@VERSION@@" "@@COMMIT@@" "@@APPNAME@@.cmd" %*
+endlocal
diff --git a/resources/server/bin/code.sh b/resources/server/bin/remote-cli/code.sh
similarity index 86%
rename from resources/server/bin/code.sh
rename to resources/server/bin/remote-cli/code.sh
index 2fadda2f2ba..20ed0ff4cfb 100644
--- a/resources/server/bin/code.sh
+++ b/resources/server/bin/remote-cli/code.sh
@@ -2,7 +2,7 @@
 #
 # Copyright (c) Microsoft Corporation. All rights reserved.
 #
-ROOT=$(dirname "$(dirname "$0")")
+ROOT=$(dirname "$(dirname "$(dirname "$0")")")
 
 APP_NAME="@@APPNAME@@"
 VERSION="@@VERSION@@"
diff --git a/resources/server/bin/server.cmd b/resources/server/bin/server-old.cmd
similarity index 90%
rename from resources/server/bin/server.cmd
rename to resources/server/bin/server-old.cmd
index 3b2c1b7a1e8..cdf9e5a552e 100644
--- a/resources/server/bin/server.cmd
+++ b/resources/server/bin/server-old.cmd
@@ -19,6 +19,6 @@ goto loop1
 
 :after_loop
 
-"%ROOT_DIR%node.exe" %INSPECT% "%ROOT_DIR%out\vs\server\main.js" %RESTVAR%
+"%ROOT_DIR%node.exe" %INSPECT% "%ROOT_DIR%out\vs\server\main.js" --compatibility=1.63 %RESTVAR%
 
 endlocal
diff --git a/resources/server/bin/server-old.sh b/resources/server/bin/server-old.sh
new file mode 100644
index 00000000000..593a00ae6ce
--- /dev/null
+++ b/resources/server/bin/server-old.sh
@@ -0,0 +1,12 @@
+#!/usr/bin/env sh
+#
+# Copyright (c) Microsoft Corporation. All rights reserved.
+#
+
+case "$1" in
+	--inspect*) INSPECT="$1"; shift;;
+esac
+
+ROOT="$(dirname "$0")"
+
+"$ROOT/node" ${INSPECT:-} "$ROOT/out/vs/server/main.js" --compatibility=1.63 "$@"
diff --git a/src/vs/server/extensionHostConnection.ts b/src/vs/server/extensionHostConnection.ts
index 196d2bf6b8f..864c1fba3db 100644
--- a/src/vs/server/extensionHostConnection.ts
+++ b/src/vs/server/extensionHostConnection.ts
@@ -34,12 +34,13 @@ export async function buildUserEnvironment(startParamsEnv: { [key: string]: stri
 	}
 
 	const binFolder = environmentService.isBuilt ? join(environmentService.appRoot, 'bin') : join(environmentService.appRoot, 'resources', 'server', 'bin-dev');
+	const remoteCliBinFolder = join(binFolder, 'remote-cli'); // contains the `code` command that can talk to the remote server
 	const processEnv = process.env;
 	let PATH = startParamsEnv['PATH'] || (userShellEnv ? userShellEnv['PATH'] : undefined) || processEnv['PATH'];
 	if (PATH) {
-		PATH = binFolder + delimiter + PATH;
+		PATH = remoteCliBinFolder + delimiter + PATH;
 	} else {
-		PATH = binFolder;
+		PATH = remoteCliBinFolder;
 	}
 
 	const env: IProcessEnvironment = {
@@ -58,7 +59,7 @@ export async function buildUserEnvironment(startParamsEnv: { [key: string]: stri
 		...startParamsEnv
 	};
 	if (!environmentService.args['without-browser-env-var']) {
-		env.BROWSER = join(binFolder, 'helpers', isWindows ? 'browser.cmd' : 'browser.sh');
+		env.BROWSER = join(binFolder, 'helpers', isWindows ? 'browser.cmd' : 'browser.sh'); // a command that opens a browser on the local machine
 	}
 
 	setCaseInsensitive(env, 'PATH', PATH);
diff --git a/src/vs/server/remoteExtensionHostAgentServer.ts b/src/vs/server/remoteExtensionHostAgentServer.ts
index 53dfe17a9eb..273e124852d 100644
--- a/src/vs/server/remoteExtensionHostAgentServer.ts
+++ b/src/vs/server/remoteExtensionHostAgentServer.ts
@@ -925,6 +925,7 @@ function parseConnectionToken(args: ServerParsedArgs): { connectionToken: string
 
 	let connectionToken = args['connection-token'];
 	const connectionTokenFile = args['connection-token-file'];
+	const compatibility = args['compatibility'] === '1.63';
 
 	if (args['without-connection-token']) {
 		if (connectionToken || connectionTokenFile) {
@@ -959,9 +960,11 @@ function parseConnectionToken(args: ServerParsedArgs): { connectionToken: string
 		} else {
 			connectionToken = generateUuid();
 			console.log(`Connection token: ${connectionToken}`);
-			console.log(`Connection token or will made mandatory in the next release. To run without connection token, use '--without-connection-token'.`);
+			if (compatibility) {
+				console.log(`Connection token or will made mandatory in the next release. To run without connection token, use '--without-connection-token'.`);
+			}
 		}
-		return { connectionToken, connectionTokenIsMandatory: false };
+		return { connectionToken, connectionTokenIsMandatory: !compatibility };
 	}
 }
 
diff --git a/src/vs/server/serverEnvironmentService.ts b/src/vs/server/serverEnvironmentService.ts
index 6a0eb85a994..b1320a602f4 100644
--- a/src/vs/server/serverEnvironmentService.ts
+++ b/src/vs/server/serverEnvironmentService.ts
@@ -76,6 +76,7 @@ export const serverOptions: OptionDescriptions<ServerParsedArgs> = {
 	'help': OPTIONS['help'],
 	'version': OPTIONS['version'],
 
+	'compatibility': { type: 'string' },
 
 	_: OPTIONS['_']
 };
@@ -175,6 +176,8 @@ export interface ServerParsedArgs {
 	help: boolean;
 	version: boolean;
 
+	compatibility: string
+
 	_: string[];
 }
 

From 0735c7537a7152b1f846b0250213d24ab17153cb Mon Sep 17 00:00:00 2001
From: Martin Aeschlimann <martinae@microsoft.com>
Date: Tue, 11 Jan 2022 21:25:31 +0100
Subject: [PATCH 2/3] server distro: cleaner package.json

---
 build/gulpfile.reh.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build/gulpfile.reh.js b/build/gulpfile.reh.js
index 2c474af58b6..8cacc9687c1 100644
--- a/build/gulpfile.reh.js
+++ b/build/gulpfile.reh.js
@@ -250,7 +250,7 @@ function packageTask(type, platform, arch, sourceFolderName, destinationFolderNa
 
 		const name = product.nameShort;
 		const packageJsonStream = gulp.src(['remote/package.json'], { base: 'remote' })
-			.pipe(json({ name, version }));
+			.pipe(json({ name, version, dependencies: undefined, optionalDependencies: undefined }));
 
 		const date = new Date().toISOString();
 

From 61b042132eff394d281724de19712b5a27577331 Mon Sep 17 00:00:00 2001
From: Martin Aeschlimann <martinae@microsoft.com>
Date: Tue, 11 Jan 2022 21:29:03 +0100
Subject: [PATCH 3/3] server distro: use 127.0.0.1 as default

---
 src/vs/server/main.js | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/vs/server/main.js b/src/vs/server/main.js
index ba6fb9f9844..d98fedd4048 100644
--- a/src/vs/server/main.js
+++ b/src/vs/server/main.js
@@ -28,7 +28,7 @@ async function start() {
 	// Do a quick parse to determine if a server or the cli needs to be started
 	const parsedArgs = minimist(process.argv.slice(2), {
 		boolean: ['start-server', 'list-extensions', 'print-ip-address', 'help', 'version', 'accept-server-license-terms'],
-		string: ['install-extension', 'install-builtin-extension', 'uninstall-extension', 'locate-extension', 'socket-path', 'host', 'port', 'pick-port']
+		string: ['install-extension', 'install-builtin-extension', 'uninstall-extension', 'locate-extension', 'socket-path', 'host', 'port', 'pick-port', 'compatibility']
 	});
 
 	const extensionLookupArgs = ['list-extensions', 'locate-extension'];
@@ -102,10 +102,11 @@ async function start() {
 		const remoteExtensionHostAgentServer = await getRemoteExtensionHostAgentServer();
 		return remoteExtensionHostAgentServer.handleServerError(err);
 	});
+	const host = parsedArgs['host'] || (parsedArgs['compatibility'] !== '1.63' ? '127.0.0.1' : undefined);
 	const nodeListenOptions = (
 		parsedArgs['socket-path']
 			? { path: parsedArgs['socket-path'] }
-			: { host: parsedArgs['host'], port: await parsePort(parsedArgs['port'], parsedArgs['pick-port']) }
+			: { host, port: await parsePort(host, parsedArgs['port'], parsedArgs['pick-port']) }
 	);
 	server.listen(nodeListenOptions, async () => {
 		const serverGreeting = product.serverGreeting.join('\n');
@@ -156,12 +157,13 @@ async function start() {
  * If only `--port` is provided then connect to that port.
  *
  * In absence of specified ports, connect to port 8000.
+ * @param {string | undefined} host
  * @param {string | undefined} strPort
  * @param {string | undefined} strPickPort
  * @returns {Promise<number>}
  * @throws
  */
-async function parsePort(strPort, strPickPort) {
+async function parsePort(host, strPort, strPickPort) {
 	let specificPort;
 	if (strPort) {
 		let range;
@@ -171,7 +173,7 @@ async function parsePort(strPort, strPickPort) {
 				return specificPort;
 			}
 		} else if (range = parseRange(strPort)) {
-			const port = await findFreePort(range.start, range.end);
+			const port = await findFreePort(host, range.start, range.end);
 			if (port !== undefined) {
 				return port;
 			}
@@ -189,7 +191,7 @@ async function parsePort(strPort, strPickPort) {
 			if (range.start <= specificPort && specificPort <= range.end) {
 				return specificPort;
 			} else {
-				const port = await findFreePort(range.start, range.end);
+				const port = await findFreePort(host, range.start, range.end);
 				if (port !== undefined) {
 					return port;
 				}
@@ -220,16 +222,17 @@ function parseRange(strRange) {
  * Starting at the `start` port, look for a free port incrementing
  * by 1 until `end` inclusive. If no free port is found, undefined is returned.
  *
+ * @param {string | undefined} host
  * @param {number} start
  * @param {number} end
  * @returns {Promise<number | undefined>}
  * @throws
  */
-async function findFreePort(start, end) {
+async function findFreePort(host, start, end) {
 	const testPort = (port) => {
 		return new Promise((resolve) => {
 			const server = http.createServer();
-			server.listen(port, '127.0.0.1', () => {
+			server.listen(port, host, () => {
 				server.close();
 				resolve(true);
 			}).on('error', () => {